This Sport version of the B5 S4 2.7T cat back is the more aggressive of the two systems offered by B&B however don’t let that fool you. With B&B’s proprietary Purge Resonance Technology (PRT) design muffler you still have an ear pleasing tone at low rpm cruising speed without interior resonance but with a deep, robust bark on hard acceleration. Precision hand crafting using 100% T304 stainless steel and CNC mandrel bent tubing you are sure to see the increases in horsepower and torque you so desire. For aesthetics B&B uses their twin 3.5” round double wall tips for a bold yet distinguishing look. Like all B&B exhaust system this cat back is backed with their limited LIFETIME warranty.